instantphoto.eu        Adapting a Polaroid CB70 Back on a Mamiya Universal/Pola 600SE icon flag all.gif  icon flag fra.gif 

This page will explain the mount of an adapter for the Mamiya Universal or the Polaroid 600SE on a CB70 film back, that is a back for Polaroid/Impossible integral film, be it the SX70 or the 600 version. Instead of making the adapter myself, I bought a kit from the famous action site (in Italy). It wasn't even expensive (some 70€). The seller was extremely helpful, he backed me through the process of assembling with a very basic English, but perfectly understandable.

You can make the adapter yourself of course, for example on the basis of the frame from a Polaroid 405 back. However, there is a drawback: you'll have to grind down the frame to quite some extent to get the right distance between frame and film plane. You can't just swap the 103 and the CB70, the focus would no longer be o.k.. The kit consists of two thin frames, the first be be fixed on the CB70, the second to be screwed on the first.

Here are some photos of the mounting:

The CB70 back itself.

First check whether the contact is set between pin 2 and 3 then do a function text with an empty cartridge.

The Italian kit, everything is included.

Mounting of the seals between the back and the first frame and of 4 "guides" for the next frame.

The two frames.

The first frame has beem put into place.

The first frame has been screwed and prepared for the mounting of the second. The arrow shows the part which was too long and hindered the back to be mounted on the camera. A miscalculation of the seller by just one mm, but no problem. I sent him the assembly and he redressed it at his expense.

The second frame is mounted after installing the Mamiya "claws". There is a version for the 600SE.

The CB70 back on my Mamiya Universal. The 50mm Optics cover the entire surface of the film. And yes, the "leathering" has to be changed.

To mount the camera on a tripod you will need an adapter.

First photo. Its double inversed (top-bottom, left-right) as there is no mirror. No focus problem. There was a light leak on the upper side (on the bottom of the photo). Yes it's the PX70 color protection. The colours are better and there is no shading problem after ejection of the photo, but it's still ways from a Pola. It's very grainy.

When the cartridge was empty I took off the back. There were no light seals on the back of the camera. Obviously there were no problems with a pack 100 back which has a broader frame and a dark slide. As you pull the slide only when you take a photo, there were no light leaks visible. Pretty stupid nevertheless. No leaks any more after placing new seals.


So a CB70 back on a Universal or 600SE is possible. As there is no dark slide, there are three options if you want to interchange optics: you loose one photo, you pull out the cartridge in the dark and push the cardboard dark slide on top of it or you interchange optics in a sleeve. But it's qite some fun.